Bob Gathany/The Huntsville TimesThe Botanical Garden has cancelled Saturday's horse parade and trick-or-treating. HUNTSVILLE - Due to the bad weather expected on Saturday, the Huntsville Botanical Garden is cancelling its Halloween Horse Parade and Trick-or-Treating in the Children's Garden event that was scheduled from 11 a.m. to 1p.m. There will still be candy available in the Garden Visitor's Center, 4747 Bob Wallace Avenue, for children visiting the Garden on Saturday.